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Blood:GATA1 N末端对红细胞生成的重要作用

2019-08-14 MedSci MedSci原创

Diamond-Blackfan贫血(DBA)是一种少见的先天性纯红细胞再生障碍性贫血,男女比例1.1:1,大部分病例为散发,约10%-25%的患者有家族史。

Diamond-Blackfan贫血(DBA)是一种少见的先天性纯红细胞再生障碍性贫血,男女比例1.1:1,大部分病例为散发,约10%-25%的患者有家族史。

中心点:

与DBA相关的GATA1 N末端缺失,通过差异染色质占用和修饰改变基因调控。

GATA2单倍体剂量不足可挽救GATA1突变体胚胎的红细胞生成

摘要:

GATA1突变可导致缺乏GATA1 N末端的GATA1s亚型表达,这一情况见于Diamond-Blackfan贫血(DBA)。为了更好地理解GATA1s和DBA之间的关系,研究人员全面研究了Gata1s小鼠的红细胞生成。

卵黄囊和胎儿肝造血缺陷包括终末成熟受损和红细胞祖细胞数量减少。RNA测序显示,红细胞和巨核细胞的基因表达图谱均因N末端缺失而发生变化,包括Gata2和Runx1的表达异常上调。

GATA1的N末端缺失后,红系祖细胞的整体H3K27甲基化失调。染色质结合分析显示,尽管GATA1和GATA1s的占用情况相似,但在Gata2和Runx1基因的调控元件上,H3K27me3水平显著降低。

既往研究表明过表达GATA2会损害红细胞生成,与此一致,研究人员发现GATA2的单倍剂量不足可挽救GATA1s 胎儿的红细胞缺陷。

综上所述,本研究对转录组和表观遗传特征的综合基因组分析揭示了GATA1的N末端在转录调控和红细胞成熟过程中的重要作用,这可能有助于推动DBA的治疗发展。


原始出处:

Te Ling, et al.Chromatin occupancy and epigenetic analysis reveal new insights into the function of GATA1 N-terminus in erythropoiesis.Blood 2019 :blood.2019001234; doi: https://doi.org/10.1182/blood.2019001234

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    2019-08-16 bbjsj_1981

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